Guess where the valley formed by the Urubamba River in the Per | UnManifest History

Guess where the valley formed by the Urubamba River in the Peruvian Andes near the city of Cusco and the ruins of Machu Picchu is, and where the waste quarry is.

Were it not for the development of the photos, we could take historians' word for what happened to the area in ancient times.

But so identical photos begin to raise questions, what was the river that left a trail like that of a quarry?